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//===- llvm/unittest/ADT/PointerIntPairTest.cpp - Unit tests --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "gtest/gtest.h"
#include "llvm/ADT/PointerIntPair.h"
#include <limits>
using namespace llvm;
namespace {
// Test fixture
class PointerIntPairTest : public testing::Test {
};
TEST_F(PointerIntPairTest, GetSet) {
PointerIntPair<PointerIntPairTest *, 2> Pair(this, 1U);
EXPECT_EQ(this, Pair.getPointer());
EXPECT_EQ(1U, Pair.getInt());
Pair.setInt(2);
EXPECT_EQ(this, Pair.getPointer());
EXPECT_EQ(2U, Pair.getInt());
Pair.setPointer(nullptr);
EXPECT_EQ(nullptr, Pair.getPointer());
EXPECT_EQ(2U, Pair.getInt());
Pair.setPointerAndInt(this, 3U);
EXPECT_EQ(this, Pair.getPointer());
EXPECT_EQ(3U, Pair.getInt());
}
TEST_F(PointerIntPairTest, DefaultInitialize) {
PointerIntPair<PointerIntPairTest *, 2> Pair;
EXPECT_EQ(nullptr, Pair.getPointer());
EXPECT_EQ(0U, Pair.getInt());
}
TEST_F(PointerIntPairTest, ManyUnusedBits) {
// In real code this would be a word-sized integer limited to 31 bits.
struct Fixnum31 {
uintptr_t Value;
};
class FixnumPointerTraits {
public:
static inline void *getAsVoidPointer(Fixnum31 Num) {
return reinterpret_cast<void *>(Num.Value << NumLowBitsAvailable);
}
static inline Fixnum31 getFromVoidPointer(void *P) {
// In real code this would assert that the value is in range.
return { reinterpret_cast<uintptr_t>(P) >> NumLowBitsAvailable };
}
enum { NumLowBitsAvailable = std::numeric_limits<uintptr_t>::digits - 31 };
};
PointerIntPair<Fixnum31, 1, bool, FixnumPointerTraits> pair;
EXPECT_EQ((uintptr_t)0, pair.getPointer().Value);
EXPECT_FALSE(pair.getInt());
pair.setPointerAndInt({ 0x7FFFFFFF }, true );
EXPECT_EQ((uintptr_t)0x7FFFFFFF, pair.getPointer().Value);
EXPECT_TRUE(pair.getInt());
EXPECT_EQ(FixnumPointerTraits::NumLowBitsAvailable - 1,
PointerLikeTypeTraits<decltype(pair)>::NumLowBitsAvailable);
}
} // end anonymous namespace
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